In many cases you may be able to assign the same TYPE attribute to all <LG>s or to all <DIV2>s, etc. (But don't do this without making sure that it is really justified). In Author/Editor it seems to be possible to insert an attribute globally using the FIND/REPLACE dialog box, like this:
FIND: <LG>
REPLACE WITH: <LG TYPE="stanza">
See the A/E 3.5 manual, pp. 178-179.
<LG>s should have "stanza" as the value of TYPE, unless there is something specific to the poem that supplies a different word. E.g., a narrative poem may have linegroups called "chapters" or "fyttes" or "cantos." If so, use the word that the book itself uses; otherwise just go with "stanza."
<DIV>s are more varied. In general, follow these (probably conflicting) principles:
If the designation in the book is a verbose version of a common English term, use the simpler form. E.g., if the book says "Prefatory Remarks by the Author," you shouldn't be afraid to translate this into <DIV1 TYPE="preface">
Otherwise, use whatever is there.
<DIV1 TYPE="poem">
<DIV1 TYPE="poem">
Use the most specific term that is shared by the set. In a book of sonnets, for example, you can afford to be more specific:
<DIV1 TYPE="sonnet">
<DIV1 TYPE="sonnet">
Similarly in a book of hymns or songs, you can use <DIV1 TYPE="hymn"> or <DIV1 TYPE="song">; but in an anthology of verse that mixes (say) odes, sonnets, songs, lyrics, just say TYPE="poem" for all of them.
part
section
entry
chapter
book
volume
preface
prologue
invocation
notes
table of contents
index
poem
letter
document
item
afterword
foreword
introduction
essay
entry
dedication
advertisement (use this for publishers' lists of books for sale, often found at the end of books)